I know this to be true, but don't fully understand it... if our default
behavior is to fold lower, and we change it to just fold upper... then
in theory this shouldn't break anything since what used to be folder
lower will now simply be folder upper. the only people who will have a
problem are those who quote on one end but not the other, which is bad
practice anyways... so i would say if your serious about it, make the
patch as GUC "case_folding" for upper or lower and get a taste for what
breaks inside the db.
I've tried just changing the parser to unconditionally casefold to upper. First thing that happens is that initdb breaks. In addition, you have potential issues with comparisons against the catalog's versions of standard functions as such if you allow the case folding to be changed after the catalogs are setup.
ISTM that rather than a having a GUC setting, initdb would be the right time to make this choice. I'm not saying it would be easy, but it seems (without looking into it deeply) at least possible.
cheers
andrew
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